By definition, 1 gram of water will occupy one cubic centimeter. If the object to be floated on water weighs less per cubic centimeter it will float, and if it weighs more it will sink. *For an object to float in a liquid, it must have a lower density than the liquid. For example water has a density of one kilogram per litre and ice has a density of 0.9 kg/L, so ice floats; lead has a density of about 8-9 kg/L, so it will float in Mercury (density of somwhere between 15 and 20 kg/L; please correct if you have the data).
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An object needs to be less dense than the fluid it is in to float. This can be achieved by increasing the object's volume relative to its mass. For example, a ship floats because its average density is lower than that of the water it displaces.
An object float in a liquid only when the density of the solid is lower than the density of the liquid.
An object will float when it has less density than the fluid or substance that it is placed in. The object floats upward due to buoyant forces. Similarly, objects will sink if they are dense than the fluid.
The amount of water needed to make an object float depends on the object's density and volume. The volume of water displaced by the object should be equal to or greater than the volume of the object for it to float. Adding more water will increase the buoyant force.
When an object is less dense than the fluid it is immersed in, it will experience a buoyant force pushing it up. This is due to the pressure difference between the top and bottom of the object, causing it to float or rise. It is the principle behind why less dense objects float in more dense fluids, like a boat on water.
The ability to float in liquids is called buoancy. It is regularly demonstrated by wood, which is less-dense than water, and will float (in most cases). If an object is too dense, or its weight is not distributed over a large area, then it will sink.